Carburetor



April l1, 1939. J, CAMERON CARBURETOR Filed July 29, 1937 Patented Apr. 11, 1939 UNITED s'rfrrs PATENT OFFICE signor tov New Era Carburetor Corporation,

Limited, Toronto, Ontario, Canada, a company Application July'29, 1937,'Serial No. 156,291

2 Claims.

My object in the present invention is to devise a simple and very economical carburetor in which gas lock, that is formation of gas in the fuel jets adjacent the float reservoir is entirely prevented.

I attain my object by securing a heated mixing chamber sde-by-side with a oat reservoir, the two being separated by a heat insulating partition.

The fuel jets extend diagonally upward through the partition from the bottom of the reservoir into the mixing chamber.

'I'he partition is so shaped as to provide air space about the jets through which space atmospheric air may circulate to cool the jets. The ends of the jets within the mixing chamber are thus kept warm by the warm air within the mixing chamber, while the main portion of each jet and the iioat reservoir `remain comparatively cool. To increase the cooling effect of the atmospheric air on the jets the middle part of each jet is preferably provided with fins as shown.

The invention is hereinafter more fully described and is illustrated in the accompanying drawing in which Fig. 1 is a sectional plan of the carburetor with the top of the float reservoir removed;

Fig. 2 a vertical section of the carburetor; and

Fig. 3 an elevation of one of the non-adjustable 4 fuel jets.

In the drawing like numerals of reference indicate corresponding parts in the different figures.

The oat chamber or reservoir I and the mixing chamber 5 are arranged side-by-side, and bev tween them is fitted an insulating partition, preferably arranged as follows: The partition is shown as formed of two parts I5, I5', the part I5 having a clear central space 2| formed therein extending from top to bottom of the partition. The part I5 is preferably continuous to prevent as far as possible the transfer of heat by conduction or radiation to the float reservoir. Bolts I6 extending through the side walls of the float reservoir and mixing chamber and through the insulating partition parts I5, I5 hold the parts in fixed relationship.

The mixing chamber 5 is provided with the air jacket I4 provided with an inlet 24 and an outlet 20. Heated air, when the carburetor is in use is circulated through the jacket I4 to heat the mixing chamber 5. How the air is heated is immaterial as far as the present invention is concerned, suffice it to say that it will probably be effected by means of a jacket extending round some part of the exhaust manifold.

(o1. zei- 12) The mixing chamber is horizontal and is provided with the lateral air inlet B and the vertical outlet 8. Within the air inlet is located the choke valve I of ordinary type which may be arranged for operation in any well known manner. The outlet 8 from the mimng chamber has the throttle valve 9 of ordinary type arranged therein. This Valve is actuated through the medium of the rock arm I0, which is provided with a shoulder I2 adapted to engage the stop pin II to limit the movement of the throttle valve in one direction. 'Ihe rock arm IB is also provided with the screw I3 adapted to engage the stop II to limit the movement of the throttle in the other direction. This screw I3 is the ordinary idling adjusting screw common in carburetors.

The fuel is supplied to the mixing chamber through jets I1 and I8. Each jet it will be seen extends diagonally upwards from the lower side of the float chamber and has its outlet directed diagonally across the mixing chamber towards the inner of its outlet.

As is common in carburetor practice two types of jet are employed, those numbered I 'I being non-adjustable as to ow while the central jet I8 is provided with a needle valve whereby its flow may be readily regulated in a well known manner.

It will be noted that each jet is threaded through the metal of the bottom of the float reservoir at one corner thereof and passes through the space 2I and also loosely through a hole in the part I5' of the insulating partition.

Lock nuts 22 threaded on the jets and bearing against a shoulder formed on the bottom of the float reservoir serves to lock each jet in place.

The needle valve of ordinary construction for controlling the flow of the jet I8 is indicated at 23.

An important feature of the invention is that the middle portion of each jet is provided with the cooling ribs or corrugations I9 which increase the heat transfer area of the jet. Cooling ribs or corrugations 4 are also preferably formed on the float reservoir I. When the carburetor is in operation a cooling flow of atmospheric air will take place in the space 2l which will keep fuel passing through the jets at a temperature below the vaporizing point until it reaches the portions of the jets located within the mixing chamber.

From the above description it will be seen that I have devised a carburetor construction which will satisfactorily attain the objects of my invention as set out in the preamble to this specilication.

What I claim; as my invention is:

1. The combination in a carburetor of a float reservoir; a mixing chamber having an inlet and outlet and positioned close to but spaced from one side Wall of the float reservoir; heat insulation comprising a front Wall fitted against the said side Wall of the mixing chamber and side walls tted against the adjacent Wall of the float chamber, the insulation forming with said Wall of the float chamber a conduit through which air may circulate; heating means for the mixing cham ber comprising a hot air jacket extending about the body of the said chamber leaving free the Wall adjacent the float reservoir; and a fuel jet extending diagonally upward from the bottom of the reservoir into the mixing' chamber through the conduit aforesaid and the adjacent Wall of the mixing chamber.

2. The combination in a carburetor of a oat reservoir; a mixing chamber having an inlet and outlet and positioned close to but spaced from one side wall of the float reservoir; heat insulation comprising a front wall tted against the said sidel Wall of the mixing chamber and side Walls fitted against the adjacent Wall of the float chamber, the insulation forming with said wall of the iioat chamber a conduit through which air may circulate; heating means for the mixing chamber comprising a hot air jacket extending about the body of the said chamber leaving free the wall-adjacent the float reservoir; and a fuel jet extending diagonally upward from the bottom of the reservoir into the mixing chamthe jet in the air conduit being formed with cooling ribs.

JOHN CAMERON. 

